Question

所以，我想制作这个应用程序，将我动态创建的EditTexts放入列表，然后从该列表中读取，但我有点卡住，我的应用程序崩溃。请你告诉我我在做什么错了？我测试了不同的东西，试图改变一些东西，但我没有发现问题。我试图看看它是否能显示出不能[1]，但即使在尝试时它也会崩溃。这是我的代码：

    List<EditText> allpret = new ArrayList<EditText>();
List<EditText> allcant = new ArrayList<EditText>();

public void produsnou(View v) {
    LinearLayout l1 = (LinearLayout) findViewById(R.id.layout1);
    EditText et = new EditText(this);
    et.setHint("Produs");
    l1.addView(et);

    LinearLayout l2 = (LinearLayout) findViewById(R.id.layout2);
    EditText et2 = new EditText(this);
    et2.setHint("Cantitate");
    et2.setInputType(InputType.TYPE_CLASS_NUMBER
            | InputType.TYPE_NUMBER_FLAG_DECIMAL);

    allcant.add(et2);
    l2.addView(et2);

    LinearLayout l3 = (LinearLayout) findViewById(R.id.layout3);
    EditText et3 = new EditText(this);
    et3.setHint("Pret");
    et3.setInputType(InputType.TYPE_CLASS_NUMBER
            | InputType.TYPE_NUMBER_FLAG_DECIMAL);
    l3.addView(et3);

    allpret.add(et3);

}



public void calculeaza(View v) {
    String[] cant = new String[allcant.size()];

    for (int j = 0; j < allcant.size(); j++) {
        cant[j] = allcant.get(j).getText().toString();

        String[] pret = new String[allcant.size()];

        for (int k = 0; j < allpret.size(); k++) {
            pret[k] = allpret.get(k).getText().toString();
        }



        TextView totalf = (TextView) findViewById(R.id.total);
        totalf.setText("Total: " +cant[0]);

    }

}

这是logcat：

06-08 23:58:07.655: E/AndroidRuntime(7728): FATAL EXCEPTION: main
06-08 23:58:07.655: E/AndroidRuntime(7728): java.lang.IllegalStateException: Could not execute method of the activity
06-08 23:58:07.655: E/AndroidRuntime(7728):     at android.view.View$1.onClick(View.java:3704)
06-08 23:58:07.655: E/AndroidRuntime(7728):     at android.view.View.performClick(View.java:4232)
06-08 23:58:07.655: E/AndroidRuntime(7728):     at android.view.View$PerformClick.run(View.java:17318)
06-08 23:58:07.655: E/AndroidRuntime(7728):     at android.os.Handler.handleCallback(Handler.java:615)
06-08 23:58:07.655: E/AndroidRuntime(7728):     at android.os.Handler.dispatchMessage(Handler.java:92)
06-08 23:58:07.655: E/AndroidRuntime(7728):     at android.os.Looper.loop(Looper.java:137)
06-08 23:58:07.655: E/AndroidRuntime(7728):     at android.app.ActivityThread.main(ActivityThread.java:4921)
06-08 23:58:07.655: E/AndroidRuntime(7728):     at java.lang.reflect.Method.invokeNative(Native Method)
06-08 23:58:07.655: E/AndroidRuntime(7728):     at java.lang.reflect.Method.invoke(Method.java:511)
06-08 23:58:07.655: E/AndroidRuntime(7728):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1038)
06-08 23:58:07.655: E/AndroidRuntime(7728):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805)
06-08 23:58:07.655: E/AndroidRuntime(7728):     at dalvik.system.NativeStart.main(Native Method)
06-08 23:58:07.655: E/AndroidRuntime(7728): Caused by: java.lang.reflect.InvocationTargetException
06-08 23:58:07.655: E/AndroidRuntime(7728):     at java.lang.reflect.Method.invokeNative(Native Method)
06-08 23:58:07.655: E/AndroidRuntime(7728):     at java.lang.reflect.Method.invoke(Method.java:511)
06-08 23:58:07.655: E/AndroidRuntime(7728):     at android.view.View$1.onClick(View.java:3699)
06-08 23:58:07.655: E/AndroidRuntime(7728):     ... 11 more
06-08 23:58:07.655: E/AndroidRuntime(7728): Caused by: java.lang.IndexOutOfBoundsException: Invalid index 3, size is 3
06-08 23:58:07.655: E/AndroidRuntime(7728):     at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:251)
06-08 23:58:07.655: E/AndroidRuntime(7728):     at java.util.ArrayList.get(ArrayList.java:304)
06-08 23:58:07.655: E/AndroidRuntime(7728):     at com.example.testlayout.MainActivity.calculeaza(MainActivity.java:66)
06-08 23:58:07.655: E/AndroidRuntime(7728):     ... 14 more
06-08 23:58:07.680: D/dalvikvm(7728): GC_CONCURRENT freed 237K, 11% free 7249K/8135K, paused 2ms+3ms, total 38ms
06-08 23:58:17.125: I/Process(7728): Sending signal. PID: 7728 SIG: 9

Answer 1

您的内部for循环 - 尝试使用k作为索引的循环 - 会尝试永远循环，因为您要将j与allpret.size()进行比较k。尝试：

    for (int k = 0; k < allpret.size(); k++) {
        pret[k] = allpret.get(k).getText().toString();
    }

应用程序崩溃了，为什么会这样？

1 个答案: